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Smallest semiprime containing exactly n 0's.
0

%I #8 Aug 24 2020 08:52:35

%S 10,1003,10001,100001,1000001,10000001,100000001,1000000006,

%T 10000000003,100000000007,1000000000007,40000000000003,

%U 200000000000005,1000000000000003,10000000000000003,200000000000000006,1000000000000000007,10000000000000000001,200000000000000000001

%N Smallest semiprime containing exactly n 0's.

%e a(2) = 1003 because 1003 = 17 * 59 is the smallest semiprime containing exactly two 0's.

%Y Cf. A001358.

%K base,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Apr 24 2005

%E More terms from _Amiram Eldar_, Aug 24 2020